Simulated draft pot-type oil burner



Oct. 3, 1950 c. A. MILLER ET AL SIMULATED DRAFT POT-TYPE OIL BURNERFiled May 6, 1947 QMCLILD o q v gow profiop o o m o o oo 0 oo o 000 000000 o 0 00000 9 00 6 000000 000 00000000 0 000.00 0000 000 000000000000000 INVENTORT CLARENCE A. MILLER. JOHN THOMSON ATTOPNEK WaxPatented Oct. 3, 1950 UNITED STATES PATENT OFFICE- SIMULATED DRAFTPOT-TYPE OILQBURNER ClarenceA. Miller and J ohn'Thomson, Pet'aluma,Calif., assignors to Kresky Mfg. 00., -Inc;,. Petaluma, Calif.,-acorporation of California Application May 6, 1947, Serial No. 746,244

(Cl. l'58-9l 4 Claims. 1

This invention relates to oil burners, and especially to improvements inoil burners of'the-stimulated or natural draught pot type of thecharacter disclosed in Kresky Patent No. 1,912,713, dated June 6, 1933,Miller Patent No.'2',391,585-, dated December 25, 1945, and Miller etal., copending application for patent Serial No. 7 33,292, filed March8, 1947. The assigneeof the present application and the assignee of thecopending Serial Number 733,292'are the same.

It is the principal object of the present invention to provide an oilburner of the-stimulated or natural draught pot type wherein-air isintroduced to the volatile gases 'for combustion in steps, namely, asprimary air, secondary air and auxiliary air. We have'found that airintroduced in the primary stage,i. e. adjacent to the surface of the oilto be burned, in a more or less restricted area, followed byintroduction of secondary air in a greater area and upwardly in thedirection of flameoutlet, increases combustion efficiency, as disclosedin copendingapplication Serial No. 733,292. The addition of air, whichwill be referred to hereinafter as auxiliary air, from a point adjacentto the top of the burner and from a point laterally of the pathoft-heflame in the direction of'thevertical path of the flame emitted fromthe'burner-into the furnace unit and tends to project free carbonorcarbon in suspension which has not yet been oxidized into the path oftravel of the flame to insure burning thereof in order-to produce a moreper feet oxidation of the combustible.

We have foundthat the provision of concavoconvex side walls in anelongated" burner of the char cter generally d sclosed in "said- UnitedStates Letters Patent No. 1,912,713,which: is-nro videc with sp ced aertures for admission of the air, enabl s us to obtain combustionefiiciency of a hi h order.

Other ob ects' and advantages will become anna rent nporxreferr ng'to'the accompanvin soeciflcat on. and drawings; in-whiclrsimilarcharactersof reference represent correspondingparts in the several views.

hollow top castingA, open at thetop, as 8113 3, to form a throat forflame emission. The top casting A is provided with vertically dependingend walls 2 and depending opposed concave-com vex side walls 3, whichsaid w'a1ls 2 and 3' are' disposed partially within a bottom casting C.

The top and'bottom castings A and C are disposed within an air box D,which in turn is con nected to a source of air by a pipe E1 or the like.The bottom casting is provided with end shelves 5, upon which rest'thebottoms of end wallsZ' of the top casting-"and with an oil sump 6disposed centrally of the floor 1, which is inclined slightly downwardlyfrom opposite endstowardthe sumpi A pipe F'is connectedto a suitablesource of 'oil supply and leads to the sump 6. The'bottom casting isprovidedwith vertical end'wall's'fi'and; preferably, arcuate side walls9 provided with flanges I'l. The'side and end walls of the top castingare: also provided with flanges 1'2 and'the said flanges H and l2'areconnected'together 'by'. bolts !3;*or other-suitable means. Referring toFig. '3, it will'be noted that the side walls s of the top casting arespaced inwardly from the side walls'9'of the'bottom casting to form airdistribution chambersG'. The bottom casting C is spaced inward y fromthe air box D so that air entering through'pipe E'may-have access totheair distributing chambers G for emission therefrom through the spacediperforations Mprovided in the'walls 3 'ofthe top casting for 'mixing'with the volatile gases in: mixing chamber M.

We prefer to provide a plurality of spaced notches l-5 in-the-bottoms ofthe walls 3, disposed normally adjacent'to the level of the oilcontained inthe saidbottom casting; As hereinbefore mentioned, the floorof the bottom casting slopes slightly from opposite ends toward the sumpso that oil, admitted into the sump, spreads radua lytherefrom over theentire floor of said casting in order to-facilitate ignition and quickheating response.

Asrindicated in diagrammatic Fig. 4,-air isintroduced. into the air boxand flows therefrom tmdistributingichamber Gfor emission therefrom inthe direction of the indicating -arrowsH, J and K to constitute, resectively, primary, secondary and auxiliarv air. The arrows H, J and Kindi- V cate the position of primary, secondary and auxiliarv air flowin a more or less arbitrarv manner as it is obviously impossible todetermine precisely where the primary, secondary and auxiliary air flowsare defined relative to one another. The auxiliary air K is designatedas that air which flows from adjacent to the top of the top casting intothe flame, indicated at L, for the purpose of forcing combustibleparticles, namely, free carbon, back into the path of the flame forcomplete combustion thereof. The substantially verticaly directed wallof auxiliary air K forces free carbon into the flame L for completecombustion in the furnace unit (not shown) disposed above the throat Bof the top c sting. Formerly, free carbon which escaped from the mixinchamber was a waste product.

The walls 3, as hereinbefore mentioned, extend the length of the top csting A and protrude convexlv toward one another so that at the top ofthe burner portion, 1. e., adiacent to the apertures which admitauxiliarv air, the said walls are spaced from one another substantiallya greater d stance than at the bottom of the burner, i. e., adjacent tothe normal level'of oil. The distributin chambers G, formed by theconcave sides of wal s 3 and the inner arcuate surfaces of wa s 9 tend.to revent undesirable turbul nce and edd ing of air em tt d therefromparallel to the surface of oil contained in the bottom casting while airemitted from holes higher in the walls is projected u wardl at aprogressively greater angle; the auxiliary air be= in rojected upwardlyat the steepest pitch.

While We have described our invention in more or less. specific detailfor purposes of clarity of description by way of example andillustration, it is understood that various changes and modificationsmay be'made within the spirit of the invention and the scope of theappended claims.

We claim:

1.. In an oil burner, the combination comprising an elongated bottommember having side walls, a door portion and. a sump portion; said floorportion inclined downwardly slightly from opposite ends toward said sumpportion, means to supply oil to said sump portion, a top member havingconvexly formed side walls convexly opposed to one another disposedpartially within said bottom member, said convex walls being ofsubstantially uniform Convex curvature extending from a vertical portionat the bottom of the walls to a horizontal portion at the tops thereof,and a plurality of rows of spaced apertures provided in said convex sideWalls from end to end and top to bottom, said apertures each formedperpendicular to the plane of the wall through which it is provided atthe location thereof whereby each succeeding row of apertures frombottom to top of said walls is arranged to introduce air above andacross said floor portion at an ever increasing angle relative to thehorizontal.

2. In an oil burner, the combination of a bottom member havin side Wallsand end walls, a top member having opposed concavo-convex side Wallsconvexly opposed to one another disposed partially within said bottommember, said concavo-convex walls being each of substantially uniformand equal convex curvature extending from a vertical portion at thebottoms of said walls to. a horizontal portion at the tops thereof, anda plurality of rows of spaced apertures provided in each of saidconcavo-convex Walls and arranged from top to bottom and end to endthereof, said apertures each formed perpendicular to the plane of thewall through which it is provided at the location thereof whereby eachsucceeding row of apertures from bottom to top of said walls is arrangedto introduce air above and across said bottom member at an everincreasing angle relative to the horizontal.

.3. In an oil burner, the'combination according to claim 2 and whereinthe bottoms of said side walls of said bottom member are curved inwardlytoward one another and said concavoconvex walls of said top member arespaced in- Wardly from said side Walls of said bottom memher.

4. An oil burner comprisin an elongated mixin chamber open at the topand defined by two convex side walls convexly opposed to one anotherwhereby said side walls are at least twice as far apart at the topsthereof as at the bottoms thereof, each said wall having a substantiallyuniform convex curvature extending from a vertical portion at thebottoms thereof to a horizontal portion at the tops thereof, and aplurality of rows of spaced apertures provided in said side walls andarranged from top to bottom thereof whereby primary air may beintroduced through said perforations adjacent to the bottoms of" saidwalls and auxiliary air may be emitted from said perforations adjacentto the tops of said Walls, said apertures each formed perpendicular tothe plane of the wall through which it is provided at the locationthereof whereby each succeeding row of apertures from bottom to top ofsaid walls is arranged to im 7 troduce air into said mixing chamber atan ever increasing angle relative to the horizontal from 1 the bottomtoward the top of each said side walls.

CLARENCE A. DEILLER. JOH'N THOMSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,912,713 Kresky June 6, 19332,252,162 Breese Aug. 12, 1941 2,391,585 Miller Dec. 25, 1945 2,393,176Livar et a1. Jan. 15, 1946

